Common Moon Snail (juvenile) or Shark's Eye (fragment)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Naticidae, Genus: Neverita, Species: Neverita duplicata · Naticidae (Moon Snail family) · Gastropod; specifically the apex/spire portion of a spiral univalve.
Species
Neverita duplicata (likely)
Shell Type
Gastropod; specifically the apex/spire portion of a spiral univalve.
Family
Naticidae (Moon Snail family)
Size
Approximately 10-12mm in diameter. This represents a juvenile specimen or the durable core of a larger shell; typical adults of this species reach 3-5 inches.
Color & Pattern
Uniform creamy yellowish-tan to pale gold with a translucent quality. The central whorls (the apex) show a darker grey-brown point. Patterning is minimal, showing smooth growth lines and a slight pearlescent sheen due to water and wear.
Rarity
Very Common; these are among the most frequently found predatory snails on Atlantic and Gulf beaches.
Habitat
Coastal marine environments, typically found in intertidal zones or shallow subtidal waters with sandy or muddy substrates where they can burrow.
Geographic Range
Common along the Western Atlantic coast from Massachusetts to Texas and down through the Caribbean.
Description
A smooth, globose gastropod fragment featuring a low spire and a rapidly expanding final whorl. The texture is porcelain-like and polished by wave action. The center shows a distinct dark spiral 'eye' where the embryonic shell began.
Key Features
The distinctive 'eye' at the apex, the flattened low spire, and the dense, smooth shell wall. Moon snails are easily identified by their 'ear-shaped' aperture and the large callus often covering the umbilicus (though the aperture is not visible here).
Collector Value
Low. While beautiful for its 'eye' appearance, this specimen is incomplete and very common. It is a 'beach find' quality rather than 'gem' quality.
Condition Notes
Fair. This is a beach-worn specimen. The outer lip is broken away, leaving only the central axis and spire. The polishing is natural from sand and surf erosion.
Interesting Facts
Moon snails are formidable predators that use a specialized tongue (radula) and acid to drill perfectly round holes into the shells of bivalves to consume them. Their egg cases, known as 'sand collars,' are often found on beaches and look like circular pieces of plastic or rubber.
Ecological Role
Active predator in the sandy benthic community, helping regulate populations of clams and other bivalves. They are in turn eaten by sea stars and larger crabs.
Similar Species
Polinices lacteus (Milk Moon Snail) which is typically whiter, or Euspira heros (Northern Moon Snail) which grows larger and lacks the dark umbilical callus.
Beach Finding Tips
Look for these in the 'wash' line after a high tide, especially on flat sandy beaches. Look for small, pearl-like round objects among the shell grit.